#include <iostream>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <cstring>
#include <arpa/inet.h>

#define SERVER_PORT 9999
#define BUFFER_SIZE 128

int main()
{
    /* 创建套接字的句柄 */
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd == -1)
    {
        perror("socket error:");
        exit(-1);
    }

    /* 绑定Ip和端口信息 */
    struct sockaddr_in localAddress;
    /* 清空结构体脏数据 */
    memset(&localAddress, 0, sizeof(localAddress));
    /* 地址族是IPV4 */
    localAddress.sin_family = AF_INET;
    localAddress.sin_port = htons(SERVER_PORT);
    /* 设置全通规则 */
    localAddress.sin_addr.s_addr = htonl(INADDR_ANY);
    bind(sockfd, reinterpret_cast<const struct sockaddr *>(&localAddress), sizeof(localAddress));

    char buffer[BUFFER_SIZE] = {0};

    while (1)
    {
        recvfrom(sockfd, buffer, sizeof(buffer), 0, NULL, NULL);
        std::cout << "buffer:" << buffer << std::endl;
        memset(buffer, 0, sizeof(buffer));
    }
    return 0;
}
